European aristocrats Toulon stand on the threshold of an unprecedented third successive European title on Saturday but in Clermont Auvergne, face a fellow big-budget rival desperate for a first major trophy.

Leinster face a Toulon team who usurped them as the kings of Europe in a mouthwatering Champions Cup semi-final clash on Sunday that the Irish side's head coach Matt O'Connor has billed as a "huge challenge".